Here's a couple of great articles written by George R. Gibson concernin early banjo history. A lot of what he talks about involves primarily the mountainous regions but there's also a good deal of other prevalent information.
Gourd Banjos: From Africa to Appalachia
The Banjo in Appalachia (part 1)
The Banjo in Appalachia (part 2)
Gourd Banjos: From Africa to Appalachia
The Banjo in Appalachia (part 1)
The Banjo in Appalachia (part 2)
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